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In the SL or heterostructure (HS),it usually displays many new curious properties different from the constituting bulk materials1.Especially,the SL or HS,in which,one constitute is a perovskite with the structure cation charge layer and anion charge layer alternatively arranged,e.g.KNbO3 and LaAlO3,the other constitute is a perovskite or other neutral layer material,e.g.